42 C.F.R. § 124.603
(a) General.
(2) A person is residing in the facility's service area for purposes of this section if the person:
(b) Emergency services.
(c) Third party payor programs.
(1) The facility shall make arrangements, if eligible to do so, for reimbursement for services with:
(d) Exclusionary admissions policies. A facility is out of compliance with its community service assurance if it uses an admission policy that has the effect of excluding persons on a ground other than those permitted under paragraph (a) of this section. Illustrative applications of this requirement are described in the following paragraphs:
(1) A facility has a policy or practice of admitting only those patients who are referred by physicians with staff privileges at the facility. If this policy or practice has the effect of excluding persons who reside (or for title XVI facilities, are employed) in the community from the facility because they do not have a private family doctor with staff privileges at the facility, the facility would not be in compliance with its assurance. The facility is not required to abolish its staff physician admissions policy as a usual method for admission. However, to be in compliance with its community service assurance it must make alternative arrangements to assist area residents who would otherwise be unable to gain admission to obtain services available in the facility. Examples of alternative arrangements a facility might use include:
(2) A facility, as required, is a qualified provider under the title XIX medicaid program, but few or none of the physicians with staff privileges at the facility or in a particular department or sub-department of the facility will treat medicaid patients. If the effect is that some medicaid patients are excluded from the facility or from any service provided in the facility, the facility is not in compliance with its community service assurance. To be in compliance a facility does not have to require all of its staff physicians to accept medicaid. However, it must take steps to ensure that medicaid beneficiaries have full access to all of its available services. Examples of steps that may be taken include: